A kitchen sink sprayer gets daily use in most St. Louis homes, which makes it one of the first fixtures to show wear. A small drip under the sink, or a spray head that keeps dripping after use, is usually easy to trace if you check things in order. The steps below help you find the source before you buy parts or call anyone.
Understand what you are looking at
The sprayer is a pull out hose that connects to the faucet body. Water flows from the supply lines under the sink, through a valve inside the faucet base called a diverter, up the hose, and out through the spray head. When you let go of the head, the diverter should send water back to the main spout. A weighted clip under the sink helps the hose retract. Each connection is a possible leak point: the spray head, the hose itself, the connection under the sink, and the base of the faucet where the hose enters.
Step 1: Dry the area and watch
Start by drying the sink base, the cabinet floor, and the hose with paper towels. Turn the faucet on for a few seconds, turn it off, then check again after a few minutes. Paper towels placed under each connection can also help you see where the water first appears. Note when the drip happens. A drip only while spraying points to a different part than a drip that continues when the sprayer is at rest.
Step 2: Check the spray head and diverter
If water drips from the spray head when the faucet is off, a worn diverter or check valve is a common cause. Mineral crust around the nozzle is another clue. Hard water deposits can keep the valve from closing fully, and they can also clog the small spray openings. If your model allows it, remove the spray head and soak the nozzle in a mild solution of household vinegar for a while, then rinse it well. If the drip continues after cleaning, the diverter may need replacing, which is usually a faucet part and not a hose part.
Step 3: Inspect the hose
Pull the hose out slowly and look along its full length, including the section that runs under the sink. Look for cracks, soft spots, bulges, or places where the hose has rubbed against a cabinet edge or a water line. A kinked hose can also restrict flow and make the sprayer feel weak. Check that the counterweight clip is not pinching the hose or pulling it tight when it retracts.
Step 4: Check the connection under the sink
Before touching any fittings, close the supply valves under the sink by turning them clockwise until they stop. Then open the faucet briefly to release the pressure in the lines. Once the area is dry, look at the point where the hose attaches to the supply. Many sprayers use a quick connect fitting or a threaded nut with a washer. A drip here often means a loose nut or a worn washer. Snug the nut gently with the right tool. Overtightening can crack plastic fittings, so tighten only until the drip stops.
Step 5: Check where the hose enters the faucet
If the leak shows at the base of the faucet, the hose connection inside the faucet body may be the source. Look for water running down the faucet stem or collecting around the mounting nut. Some faucets have an O ring or seal at this junction. Replacing that seal usually means removing the faucet, so take photos of the parts before you take anything apart. If the faucet body itself shows cracks, that is a sign to replace the whole fixture rather than repair it.
Keep St. Louis water in mind
Water in St. Louis carries dissolved minerals that leave white or chalky crust on fixtures over time. That crust is not proof of a failed part on its own, but it can stiffen moving parts and clog small openings. Wiping the spray head and faucet base during regular cleaning helps keep the valves working smoothly. If you have a water softener or a salt free unit, pay attention to whether crust is building up faster than before, since a change like that can be useful when you are checking how your water system is performing.
When to call for help
Some sprayer problems are simple, and some are not. Call a licensed plumber if the leak is inside a wall or cabinet, if the shutoff valves do not close fully, if the faucet body is cracked, or if you see corrosion on the supply lines. Get help too if you are unsure which part to order. Bring the faucet make and model, photos of the connection under the sink, and a note of when the leak happens. This keeps the conversation short and reduces the chance of buying the wrong part.